Early active monitoring method of wellbore gas invasion based on low frequency elastic wave response characteristics
An elastic wave, low frequency technology, applied in the field of analysis and measurement control, can solve the problems of received signal energy attenuation, poor sensitivity and reliability, long acoustic wave propagation path, etc., to reduce the false alarm rate, high reliability, detect gas intrusion The effect of time advance
Active Publication Date: 2018-07-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The sound wave propagation path of this technical solution is long, the received signal energy attenuation is significant, and there is more noise interference, especially in the early stage of gas invasion with low gas content, the abnormal response characteristics of sound waves are often covered by noise, and the sensitivity and reliability of monitoring Poor sex
Theoretically, the change of sound wave propagation characteristics is very beneficial to the early monitoring of gas intrusion, but it is still not perfect at present. The difficulty lies in minimizing the attenuation effect and identifying characteristic signals
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0036] Such as Figure 1~3 As shown, the early active monitoring system for wellbore gas invasion based on low-frequency elastic wave response features includes a downhole wireless signal transmitter 3 for wireless communication and a ground control center 4, and a downhole monitoring sub-section 2 connected to the downhole wireless signal transmitter 3, The downhole monitoring nipple 2 is located between the drill pipe 1 and the drill bit, including:
[0037]The elastic wave pulse launching plate 21 includes an annular elastic wave launching plate base 211, and the elastic wave launching plate base 211 is provided with four centering stabilizing fins evenly distributed along the circumferential direction of the ring (which can effectively prevent the downhole monitoring sub-joint 2 from being stuck in the well bore. eccentric to ensure the accuracy of the monitoring results), a low-frequency piezoelectric induction piece I212 is arranged in the center of each centering wing, ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses an early active monitoring system and method for wellbore gas invasion based on low-frequency elastic wave response characteristics, which can monitor the gas content of the annular space near the top of the drill bit in real time during the drilling process, detect gas invasion as early as possible and give a timely warning, The monitoring is sensitive and reliable, buying valuable time for surface design and implementation of well control operations, and ensuring the safety of oil and gas drilling projects. During the drilling process, the drilling fluid flows through the downhole monitoring sub from the annular space, and the downhole monitoring sub transmits pulse signals at a fixed frequency and converts the received response signals into electrical signals, and extracts the first arrival time and peak value of the electrical signals. The attribute value is encoded to determine whether gas intrusion has occurred, and if it is determined that gas intrusion has occurred, the gas intrusion information will be sent to the ground control center through the downhole wireless signal transmitter.
Description
technical field [0001] The invention relates to a monitoring method, in particular to an early active monitoring method for wellbore gas invasion based on low-frequency elastic wave response characteristics. It belongs to the technical field of analysis and measurement control. Background technique [0002] In order to meet the needs of the national energy strategy, oil and gas drilling technology continues to develop. Currently, oil and gas drilling is developing towards deeper formations and deep ocean waters. Gas kick refers to the entry of formation gas into the wellbore annulus due to pressure difference or substitution, which is a common drilling complication. If gas intrusion is not handled properly, it will further develop into wellhead overflow, or even blowout accident, resulting in major production safety accidents. At present, gas intrusion monitoring is mainly carried out on the ground or near the wellhead, such as the monitoring of fluid volume changes in dri...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/10
CPCE21B47/10
Inventor 王子振王瑞和武加锋薛启龙李天阳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)